The intrinsic activity of Co(OH)₂ for oxygen evolution reaction (OER) may be elaborately improved through the suitable valence adjustment. Ce modification at electronic level is proved to be an efficient strategy owing to the flexible transformation of Ce³⁺/Ce⁴⁺. Herein, Ce_0.21@Co(OH)₂ with the optimized Ce doping have been fabricated to tailor the fast electron transfer for the enhanced activity and stability for OER. Firstly, the obtained core–shell structure composed of vertical loose Co(OH)₂ sheets not only exposes a large number of active sites, but also provides channels for Ce doping. Secondly, the high pressure microwave with instantaneous heating can fast introduce Ce into Co(OH)₂, obtaining Ce_x@Co(OH)₂ with well dispersion and close integration. The intimated interaction between Ce and Co species may provide the “d–f electronic ladders” for accelerating electron transfer of the catalytic surface. Meanwhile, Ce promotes the formation of Co-superoxide intermediate and/or the release of oxygen, which is considered to be the rate-determining step for OER. The electrochemical measurements confirmed the low overpotential of 300 mV at 10 mA cm⁻² and great stability of Ce_0.21@Co(OH)₂ for OER. This work demonstrates a meaningful approach to realize the tuned electronic structure through metal doping.

通过适当的化合价调节，可以精细地提高Co（OH）₂对氧释放反应（OER）的固有活性。由于Ce ³⁺ / Ce ⁴⁺的灵活转化，电子水平的Ce修饰被证明是一种有效的策略。本文中，已经制备了具有优化的Ce掺杂的Ce _0.21 @Co（OH）₂，以定制快速电子转移，以增强OER的活性和稳定性。首先，获得的核-壳结构由垂直的疏松Co（OH）_2组成床单不仅暴露出大量的活性位点，而且还提供了铈掺杂的通道。其次，瞬时加热的高压微波可以将Ce快速引入Co（OH）₂，得到具有良好分散性和紧密结合性的Ce _x @Co（OH）₂。Ce和Co物种之间的亲密相互作用可能会提供“ d-f电子阶梯”，以加速催化表面的电子转移。同时，Ce促进了超氧化物中间产物的形成和/或氧气的释放，这被认为是OER的速率决定步骤。电化学测量证实，在10 mA cm ^-2时300 mV的过低电势和Ce _0.21的高稳定性OER的@Co（OH）₂。这项工作展示了一种通过金属掺杂实现调谐电子结构的有意义的方法。